Concept explainers
a.
To determine the regression feature of a graphing utility to attempt to find the logarithmic model and explain why the result is an error message.
a.

Answer to Problem 32E
The logarithmic model
Explanation of Solution
Given:
Consider the given information,
and the data provided are (0,1),(10,0.25),(20,0.06),(5,0.55),(15,0.12),(25,0.02)
For the given data, it is understood that the point (0,1) has an error because from the given expression if (h, p) = (0,1) then it is clear that 0 is not in the domain of ln.
b.
To determine the regression feature of the graphing utility to find the logarithmic model for the data.
b.

Answer to Problem 32E
The logarithmic model for the data is
Explanation of Solution
Given:
Consider the given expression,
Graph:
Calculation:
From the given expression,
Reversing the expression, it can be written as
As,
Conclusion:
Therefore, the logarithmic model is
c.
To graph: using graphing utility to plot the data and the logarithmic model in the same viewing window.
c.

Explanation of Solution
Given information: Consider the data given,
(0,1),(10,0.25),(20,0.06),(5,0.55),(15,0.12),(25,0.02)
Graph:
Interpretation: as from the following graph, it is clear that the data is fitted with the logarithmic model.
d.
To estimate the altitude using the model at a given pressure.
d.

Answer to Problem 32E
The altitude at a given pressure using the model is
Explanation of Solution
Given:
Consider the given information,
Pressure of the model is 0.75 atmosphere.
Calculation:
From the given data,
Pressure = 0.75atm
Altitude = 0.863-6.447
Conclusion:
Therefore, the altitude of the model is
e.
To estimate the pressure at an altitude of given kilometer.
e.

Answer to Problem 32E
The pressure at the altitude given is 0.15 atmosphere.
Explanation of Solution
Given:
The altitude for the model given is 13km.
Calculation:
From the graph, at altitude = 13km the pressure is 0.15 atmosphere.
Chapter 3 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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